Which measurement is accurate, dr browns or medela?

I noticed that the dr browns bottle are showing that there is much less in them than the medela bottles I am pouring into them from. Yesterday I had one of those little 2.5 bottles which has more detailed measurements than the usual ones and when I put it into a dr browns in barely went over the 2 oz mark. Like it was 2.1 instead. With the other medela bottles I have noticed that when it's up to the five mark (I mostly have the ones that are bumps and not printed on) it is more like 4.5 according to dr browns. Which one is right?

I've also been wondering if I'm crazy or if they are off! I pour from medela to lansinoh bags then when I defrost and pour into Dr Browns its always almost hakf an ounce less! I was wondering if some of the water was going...somewhere while frozen.

What sucks more is the little Medela bottles don't match with the 8 oz ones either! What I finally decided to do was pick one to measure from and go with it for all my comparasions and phone app. I went with the Avent bottle because that's what she eats from and how we were telling each other how much she ate. So I pump and dump it into an empty Avent bottle, note it and then pour it into a big storage bottle. Extra steps, but helps my neurosis!

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